num1 = {}
num2 = {1, 2, 2,True,3,0,False}
print(num2)
print("True",int(True))

print(2 in num2)
list1 = frozenset(num2)
print(list1)
print(type(list1))

set1 = {1,1.2,1.1}
print(set1)

# 0
# 去重

# 1
# frozenset

# 2
# len()

# 3
# 报错，集合无法下标取值

# 4
# 不一样,{}内不能放列表数据

# 5
# 看首位元素的类型